This was the former default web application built on top of the Apache Fineract platform. It's now deprecated and replaced by the the Mifos X Web App (https://github.com/openMF/web-app maintained by the Mifos Initiative as a reference solution for financial inclusion. It is a Single-Page App (SPA) written in web standard technologies.
Reported by Mifos@FINA at https://mifosforge.jira.com/browse/MIFOSX-1733